We started using/recommending disconnected imap to our zimbra users w/ newer email clients several months ago and overall it has been a good experience. Unfortunately, we're now starting to see relatively large increases in bandwidth usage as a result (some users are using a constant 2-4GB/HR) and this is when they are not at their desk and leaving the email client open. One would think that the imap protocol would be smart enough to just check for changes and forward changes to the client, but this does not seem to be the case ...at least for some clients (I'm not really sure whether the complete imap store is being downloaded for each user hourly or not). I would assume this is a known issue - assuming that disconnected imap is here to stay, how are other admins/networks dealing w/ this?